int main() {
    char s = "aaaa
    int a = 10;
    /*
    float b = 3.14;
    char c = 'A';
    char str[] = "Hello, World!";
    
    // 条件判断
    if (a > 5) {
        printf("%s\n", str);
        printf("a = %d, b = %f\n", a, b);
    } else {
        printf("a <= 5\n");
    }
}